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Simplifying 11u + 15 + -15u = -20 + u Reorder the terms: 15 + 11u + -15u = -20 + u Combine like terms: 11u + -15u = -4u 15 + -4u = -20 + u Solving 15 + -4u = -20 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 15 + -4u + -1u = -20 + u + -1u Combine like terms: -4u + -1u = -5u 15 + -5u = -20 + u + -1u Combine like terms: u + -1u = 0 15 + -5u = -20 + 0 15 + -5u = -20 Add '-15' to each side of the equation. 15 + -15 + -5u = -20 + -15 Combine like terms: 15 + -15 = 0 0 + -5u = -20 + -15 -5u = -20 + -15 Combine like terms: -20 + -15 = -35 -5u = -35 Divide each side by '-5'. u = 7 Simplifying u = 7
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